I was just out walking the dogs when I saw this strange light in the sky.
It was about the same size and intensity as a street light, I saw red and yellow but no green. We often see high flying aircraft but their lights are much smaller and blinking, not steady.
It was moving quite fast Westwards, then stopped almost overhead and then moved off Northwards at right angles to its previous course. My view was cut off by house roofs quite quickly which is also an indicator that it was not flying so high.
There was no aircraft noise although it seemed to be relatively low.
It was too late for an aircraft from Kloten.

From the way it moved (stopping and then moving off at right angles) I would assume a helicopter but they are very noisy and usually I hear them from a long way away; and their lights blink.
Could have been a searchlight pointing down from the vehicle causing the yellow light; usually when aircraft have their landing lights on I see the beam at night like car headlights.
Could also have been a balloon but changing direction so abruptly does not fit.

So far as I know the Swiss military have no stealth helicopters but it might have been a visitor?